fix(aur): override RUSTFLAGS to swap lld→bfd for ring linker error

makepkg.conf on Arch injects -fuse-ld=lld into RUSTFLAGS which overrides
.cargo/config.toml target rustflags. PKGBUILD now explicitly patches
RUSTFLAGS at env level so bfd is used regardless of system config.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/aur/PKGBUILD

@@ -27,6 +27,12 @@ build() {
   export CARGO_HOME="$srcdir/cargo-home"
   export npm_config_cache="$srcdir/npm-cache"
 
+  # ring (used by tauri-plugin-updater → rustls) ships C/asm objects whose
+  # symbols (ring_core_*) lld cannot resolve.  Arch's makepkg.conf bakes
+  # -fuse-ld=lld into RUSTFLAGS which overrides .cargo/config.toml.
+  # Swap lld → bfd (binutils, part of base-devel) so the link succeeds.
+  export RUSTFLAGS="${RUSTFLAGS//-fuse-ld=lld/-fuse-ld=bfd}"
+
   npm install
   npm run tauri:build -- --no-bundle
 }